i tried derestricting my NRG, i took out the washer in the variator, and then took out the metal thing by the carb, and put on the standard exhaust from my sr50. I then upjetted to jet size 55, and it ran fine for about 10 minutes, then it started bogging down and making a whistling noise. I changed the jet to a 58 and it still does it, and i put in the standard 53 but it is still doing it. anyone know what is wrong?
